Abstract

The static magnetic and dynamic properties of the compound are investigated in the temperature interval . It is shown that at this compound undergoes a transition to a magnetically ordered antiferromagnet state. A distinctive feature of this compound is the presence of temperature hysteresis at the transition to the ordered state (corresponding to a first-order magnetic phase transition) and of a spontaneous magnetic moment along the axis. The paramagnetic Curie temperatures are determined. The frequency–field curves of the AFMR spectrum in the plane are investigated at a temperature below . The main magnetic parameters of the biaxial AFM — the value of the low-frequency gap and the effective magnetic anisotropy field — are determined.